What are the requirements for fireproof coatings for steel structures?

In the standard fire protection state, the thickness of the steel structure fire protection layer is mainly related to the effective gravity load and the section coefficient of the components. The surface of steel base layer of prefabricated building coated with fireproof coating for steel structure should be strictly dehydrated and degreasing. After sandblasting and rust removal reach Sa21/2 level (manual rust removal reaches St3 level or higher), please use a suitable anti-rust paint for corrosion protection.

According to CECS24: 90 Technical Specification for the Application of Fireproof Coatings for Steel Structures, when using thick-coat fireproof coatings (ie W1/D1≥22, T1≥9mm) and the fire resistance limit t≥1h, the calculation formula is as follows: where T1 is the thickness of the fireproof coating , Mm; T2 is the coating thickness during the standard test, mm; W1 is the weight of the steel beam to be sprayed, kg/m; W2 is the weight of the steel beam during the standard test, kg/m; D1 is the steel to be sprayed.

The circumference of the contact surface of the fireproof coating on the beam, mm; D2 is the circumference of the contact surface of the oxide scale on the steel beam during the scale test, in millimeters; K is the coefficient. For steel beams, K = 1; for the thickness of the protective layer of steel columns on the corresponding floors, multiply the coefficient K and set K = 1.25.

The model, name, color, and validity period of the flame-retardant coating are consistent with the quality certification documents, and there is no skinning, agglomeration, gelation, etc. after opening. The base layer of the fireproof coating should be free of dirt such as oil, dust and mud. Observe and check.

The fireproof coating should not be painted wrongly or missed. The coating should be closed, without delamination, hollow, obvious depression, powdery looseness and floating slurry and other appearance defects. The mastoid has been removed. Observe and inspect. Nowadays, a large number of steel structure super high-rise buildings have appeared, and the use of fireproof coatings in steel structures has become more and more popular. Once a fire accident occurs in a high-rise building, it is impossible to extinguish the fire in a short time due to the limitation of fire fighting equipment.

Therefore, in building design and construction, the degree of fire protection on the surface of the steel structure should be increased to increase its fire protection limit. Develop necessary fire prevention measures at one time to ensure personnel safety and reduce asset losses.

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